yeah eating grass can do that... Your gonna wanna try and keep her from doing that for a few reasons.... 1.) it will make her vomit and give her an upset tummy.... 2.) They can pick up parasites from the grass such as coccidia and hookworms which can be seen under a mircoscope when they test your puppies stool at the vet. Parasites will make your dog have loose stools and can cause vomitting as well. 3.) people fertilize their lawns and even if you dont, when it rains it can wash the chemicals into your grass and if she eats grass that has the fertilizers on it...it can be harmful for your dog and make them ill... most fertilizers are toxin free but some are not so its better to be safe then sorry

Hope that helps ya some if you have any other questions about puppy vaccines flea treatments heartworm prevention or anything at all that just let me know

I will be more than glad to help!!